Muscles Of Canine Forelimb

Question 1

What is the synsarcosis?

Answer 1

Muscular sling supporting torso between forelimbs

Question 2

Role of extrinsic muscles

Answer 2

Attach forelimb to the body

Question 3

What are intrinsic muscles?

Answer 3

Muscles with origin and insertion within the limb

Question 4

Role of synsarcosis in locomotion

Answer 4

Allows craniocaudal translation across the thorax
Spinal extension
Increases stride length

Question 5

Name extrinsic muscles of the forelimb

Answer 5

Trapezius
Omotransversarius
Brachiocephalicus
Latissimus dorsi
Pectorals

Question 6

Name deep extrinsic muscles of the forelimb

Answer 6

Rhomboideus

Serrated ventralis

Question 7

What role does the glenohumeral joint have?

Answer 7

Flexion and extension

Very little adduction or abduction

Question 8

Describe the canine glenohumeral joint

Answer 8

Joint capsule supported by lateral and medial glenohumeral ligaments

Question 9

What ligaments are present in the glenohumeral joint?

Answer 9

Lateral glenohumeral ligament

Median glenohumeral ligament

Question 10

Where is the canine glenohumeral joint?

Answer 10

Shoulder joint

Question 11

What is the normal abduction angle of the glenohumeral joint?

Answer 11

25-30 degrees

Question 12

What angle can a medial glenohumeral ligament tear lead to?

Answer 12

Around 70 degrees

Question 13

Which glenohumeral ligament is larger?

Answer 13

Medial

Question 14

What glenohumeral joint is Y shaped?

Answer 14

Medial

Question 15

What provides significant support to the glenohumeral joint?

Answer 15

Muscles

Question 16

What shape is the lateral glenohumeral ligament?

Answer 16

Small narrow strip

Question 17

Role of cranial intrinsic muscles acting on the glenohumeral joint

Answer 17

Extensors

Question 18

Role of caudal intrinsic muscles acting on the glenohumeral joint

Answer 18

Flexors

Question 19

Role of lateral and medial intrinsic muscles acting on the glenohumeral joint

Answer 19

Support

Question 20

Muscles of broad scapular origin providing lateral support to the glenohumeral joint

Answer 20

Supraspinatus

Infraspinatus

Question 21

Innervation to supraspinatus and infraspinatus

Answer 21

Suprascapular nerve

Question 22

Muscles of broad scapular origin that provide medial support to the glenohumeral joint

Answer 22

Subscapularis
Coracobrachialis (functionally insignificant)

Question 23

Innervation to subscapularis

Answer 23

Subscapular nerve

Question 24

Name the two shoulder flexors

Answer 24

Deltoideus

Teres major

Question 25

Which shoulder flexor muscle can be seen laterally?

Answer 25

Deltoideus

Question 26

Which shoulder flexor can be seen medially?

Answer 26

Teres major

Question 27

Innervation to shoulder flexors

Answer 27

Axillary nerve

Question 28

Name the shoulder extensors

Answer 28

Biceps brachii

Supraspinatus (weak shoulder extensor)

Question 29

Primary action of biceps brachii

Answer 29

Elbow flexion

Question 30

Innervation of biceps brachii

Answer 30

Musculocutaneous nerve

Question 31

What type of muscle is biceps brachii?

Answer 31

Bi-articular

Question 32

What are uni articular joints?

Answer 32

Muscles moving a single joint

Question 33

What is a bi-articular muscle?

Answer 33

Muscle moving more than one joint

Question 34

What type of joint is the glenohumeral joint?

Answer 34

Ball and socket

Question 35

Why does the glenohumeral joint primarily act in flexion and extension?

Answer 35

The socket of the joint is relatively shallow